Rawr.Mage "Item Budget" and Spell Damage

In the Item Budget display of Rawr.Mage, it lists most things as 10 of an item - 10 Int, 10 Spell Haste, 10 Spirit, etc. But Spell Damage is listed as 11.7. Wouldn't it be more useful to set this to 12, since the Epic gems have 12 Spell Damage
on them?